Clans are one of the social features in Diablo Immortal, Clans are designed to provide players who share similar interests, gameplay schedules, or goals the ability to band together and form tight-knit groups. They're a great way to communicate with numerous friends at once, organize your play, and generally just keep in touch with those you game with the most.
With a member limit of XX players, clans are intended to be smaller and invitation only. This means that while you can send a request to join a clan, you will not technically become a member unless you are invited or your request to join the clan is accepted. Also, while anyone can create or join a clan, you can only be a member of one clan at any given time.
Diablo Immortal Clans
Creating a Clan
Finding and Joining a Clan